49 CFR 179.220-7 - Materials.

Beta! The text on the eCFR tab represents the unofficial eCFR text at ecfr.gov.

§ 179.220-7 Materials.

(a) The plate material used to fabricate the inner container and nozzles must meet one of the following specifications and with the indicated minimum tensile strength and elongation in the welded condition.

(b) Carbon steel plate: The maximum allowable carbon content must be 0.31 percent when the individual specification allows carbon content greater than this amount. The plates may be clad with other approved materials.

Specifications

Minimum tensile strength (p.s.i.) welded condition
1

Minimum elongation in 2 inches (percent) weld metal (longitudinal)

AAR TC 128, Gr. B

81,000

19

ASTM A 516
2, Gr. 70

70,000

20

1 Maximum stresses to be used in calculations.

2 This specification is incorporated by reference (IBR, see § 171.7 of this subchapter).

(c)Aluminum alloy plate: Aluminum alloy plate must be suitable for welding and comply with one of the following specifications (IBR, see § 171.7 of this subchapter): * * *

Specifications

Minimum tensile strength (p.s.i.) welded condition
3 4

Minimum elongation in 2 inches (percent) weld metal (longitudinal)

ASTM B 209, Alloy 5052
1

25,000

18

ASTM B 209, Alloy 5083
2

38,000

16

ASTM B 209, Alloy 5086
1

35,000

14

ASTM B 209, Alloy 5154
1

30,000

18

ASTM B 209, Alloy 5254
1

30,000

18

ASTM B 209, Alloy 5454
1

31,000

18

ASTM B 209, Alloy 5652
1

25,000

18

1 For fabrication, the parent plate material may be 0 H112, or H32 temper, but design calculations must be based on the minimum tensile strength shown.

2 0 temper only.

3 Weld filler metal 5556 must not be used.

4 Maximum stresses to be used in calculations.

(d) High alloy steel plate: High alloy steel plate must comply with one of the following specifications (IBR, see § 171.7 of this subchapter):

(e) Manganese-molybdenum steel plate: Manganese-molybdenum steel plate must be suitable for fusion welding and must comply with the following specification (IBR, see § 171.7 of this subchapter):

Specifications

Minimum tensile strength (p.s.i.) welded condition
1

Minimum elongation in 2 inches (percent) weld metal (longitudinal)

ASTM A 302, Gr. B

80,000

20

1 Maximum stresses to be used in calculations.

(f) Plate materials used to fabricate the outer shell and heads must be those listed in paragraphs (b), (c), (d), or (e) of this section. The maximum allowable carbon content must be 0.31 percent when the individual specification allows carbon content greater than this amount. The plates may be clad with other approved materials.

(g) All appurtenances on the inner container in contact with the lading must be made of approved material compatible with the plate material of the inner container. These appurtenances must not be subject to rapid deterioration by the lading, or must be coated or lined with suitable corrosion resistant material. See AAR Specifications for Tank Cars, appendix M, M4.05 for approved material specifications for castings for fittings.

On May 8, 2015, the Pipeline and Hazardous Materials Safety Administration, in coordination with the Federal Railroad Administration (FRA), published a final rule entitled “Hazardous Materials: Enhanced Tank Car Standards and Operational Controls for High-Hazard Flammable Trains,” which adopted requirements designed to reduce the consequences and, in some instances, reduce the probability of accidents involving trains transporting large quantities of Class 3 flammable liquids. The Hazardous Materials Regulations provide a person the opportunity to appeal a PHMSA action, including a final rule. PHMSA received six appeals regarding the final rule, one of which was withdrawn. This document responds to the five remaining appeals submitted by the Dangerous Goods Advisory Council (DGAC), American Chemistry Council (ACC), Association of American Railroads (AAR), American Fuel & Petrochemical Manufacturers (AFPM), and jointly the Umatilla, Yakama, Warm Springs, and Nez Perce tribes (Columbia River Treaty Tribes) and the Quinault Indian Nation (Northwest Treaty Tribes).